X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=dygraph-layout.js;h=2552f7f8fa006c3748b6166596826a11e6bc301c;hb=b85358e2c7dc73ec1179feb17b9060e132fcdbec;hp=7948686fdc52bef60f4ace2bdaf6da42c57fa6e2;hpb=c0f54d4f7444bea88d6c26020c566b42b3fe45e5;p=dygraphs.git

diff --git a/dygraph-layout.js b/dygraph-layout.js
index 7948686..2552f7f 100644
--- a/dygraph-layout.js
+++ b/dygraph-layout.js
@@ -9,6 +9,8 @@
  * dygraphs.
  */
 
+/*jshint globalstrict: true */
+/*global Dygraph:false */
 "use strict";
 
 /**
@@ -29,8 +31,20 @@
  */
 var DygraphLayout = function(dygraph) {
   this.dygraph_ = dygraph;
-  this.datasets = new Array();
-  this.annotations = new Array();
+  /**
+   * Array of points for each series.
+   *
+   * [series index][row index in series] = |Point| structure,
+   * where series index refers to visible series only, and the
+   * point index is for the reduced set of points for the current
+   * zoom region (including one point just outside the window).
+   * All points in the same row index share the same X value.
+   *
+   * @type {Array.<Array.<Dygraph.PointType>>}
+   */
+  this.points = [];
+  this.setNames = [];
+  this.annotations = [];
   this.yAxes_ = null;
 
   // TODO(danvk): it's odd that xTicks_ and yTicks_ are inputs, but xticks and
@@ -39,80 +53,102 @@ var DygraphLayout = function(dygraph) {
   this.yTicks_ = null;
 };
 
-DygraphLayout.prototype.attr_ = function(name) {
-  return this.dygraph_.attr_(name);
-};
-
+/**
+ * Add points for a single series.
+ *
+ * @param {string} setname Name of the series.
+ * @param {Array.<Dygraph.PointType>} set_xy Points for the series.
+ */
 DygraphLayout.prototype.addDataset = function(setname, set_xy) {
-  this.datasets[setname] = set_xy;
+  this.points.push(set_xy);
+  this.setNames.push(setname);
 };
 
+/**
+ * Returns the box which the chart should be drawn in. This is the canvas's
+ * box, less space needed for the axis and chart labels.
+ *
+ * @return {{x: number, y: number, w: number, h: number}}
+ */
 DygraphLayout.prototype.getPlotArea = function() {
-  return this.computePlotArea_();
-}
+  return this.area_;
+};
 
 // Compute the box which the chart should be drawn in. This is the canvas's
-// box, less space needed for axis and chart labels.
-DygraphLayout.prototype.computePlotArea_ = function() {
+// box, less space needed for axis, chart labels, and other plug-ins.
+// NOTE: This should only be called by Dygraph.predraw_().
+DygraphLayout.prototype.computePlotArea = function() {
   var area = {
     // TODO(danvk): per-axis setting.
     x: 0,
     y: 0
   };
-  if (this.attr_('drawYAxis')) {
-   area.x = this.attr_('yAxisLabelWidth') + 2 * this.attr_('axisTickSize');
-  }
 
-  area.w = this.dygraph_.width_ - area.x - this.attr_('rightGap');
+  area.w = this.dygraph_.width_ - area.x - this.dygraph_.attr_('rightGap');
   area.h = this.dygraph_.height_;
-  if (this.attr_('drawXAxis')) {
-    if (this.attr_('xAxisHeight')) {
-      area.h -= this.attr_('xAxisHeight');
-    } else {
-      area.h -= this.attr_('axisLabelFontSize') + 2 * this.attr_('axisTickSize');
-    }
-  }
 
-  // Shrink the drawing area to accomodate additional y-axes.
-  if (this.dygraph_.numAxes() == 2) {
-    // TODO(danvk): per-axis setting.
-    area.w -= (this.attr_('yAxisLabelWidth') + 2 * this.attr_('axisTickSize'));
-  } else if (this.dygraph_.numAxes() > 2) {
-    this.dygraph_.error("Only two y-axes are supported at this time. (Trying " +
-                        "to use " + this.dygraph_.numAxes() + ")");
-  }
-
-  // Add space for chart labels: title, xlabel and ylabel.
-  if (this.attr_('title')) {
-    area.h -= this.attr_('titleHeight');
-    area.y += this.attr_('titleHeight');
-  }
-  if (this.attr_('xlabel')) {
-    area.h -= this.attr_('xLabelHeight');
-  }
-  if (this.attr_('ylabel')) {
-    // It would make sense to shift the chart here to make room for the y-axis
-    // label, but the default yAxisLabelWidth is large enough that this results
-    // in overly-padded charts. The y-axis label should fit fine. If it
-    // doesn't, the yAxisLabelWidth option can be increased.
-  }
-
-  // Add space for range selector, if needed.
-  if (this.attr_('showRangeSelector')) {
-    area.h -= this.attr_('rangeSelectorHeight') + 4;
-  }
+  // Let plugins reserve space.
+  var e = {
+    chart_div: this.dygraph_.graphDiv,
+    reserveSpaceLeft: function(px) {
+      var r = {
+        x: area.x,
+        y: area.y,
+        w: px,
+        h: area.h
+      };
+      area.x += px;
+      area.w -= px;
+      return r;
+    },
+    reserveSpaceRight: function(px) {
+      var r = {
+        x: area.x + area.w - px,
+        y: area.y,
+        w: px,
+        h: area.h
+      };
+      area.w -= px;
+      return r;
+    },
+    reserveSpaceTop: function(px) {
+      var r = {
+        x: area.x,
+        y: area.y,
+        w: area.w,
+        h: px
+      };
+      area.y += px;
+      area.h -= px;
+      return r;
+    },
+    reserveSpaceBottom: function(px) {
+      var r = {
+        x: area.x,
+        y: area.y + area.h - px,
+        w: area.w,
+        h: px
+      };
+      area.h -= px;
+      return r;
+    },
+    chartRect: function() {
+      return {x:area.x, y:area.y, w:area.w, h:area.h};
+    }
+  };
+  this.dygraph_.cascadeEvents_('layout', e);
 
-  return area;
+  this.area_ = area;
 };
 
 DygraphLayout.prototype.setAnnotations = function(ann) {
   // The Dygraph object's annotations aren't parsed. We parse them here and
   // save a copy. If there is no parser, then the user must be using raw format.
   this.annotations = [];
-  var parse = this.attr_('xValueParser') || function(x) { return x; };
+  var parse = this.dygraph_.attr_('xValueParser') || function(x) { return x; };
   for (var i = 0; i < ann.length; i++) {
     var a = {};
-    if (!ann[i].xval && !ann[i].x) {
+    if (!ann[i].xval && ann[i].x === undefined) {
       this.dygraph_.error("Annotations must have an 'x' property");
       return;
     }
@@ -138,10 +174,6 @@ DygraphLayout.prototype.setYAxes = function (yAxes) {
   this.yAxes_ = yAxes;
 };
 
-DygraphLayout.prototype.setDateWindow = function(dateWindow) {
-  this.dateWindow_ = dateWindow;
-};
-
 DygraphLayout.prototype.evaluate = function() {
   this._evaluateLimits();
   this._evaluateLineCharts();
@@ -150,36 +182,22 @@ DygraphLayout.prototype.evaluate = function() {
 };
 
 DygraphLayout.prototype._evaluateLimits = function() {
-  this.minxval = this.maxxval = null;
-  if (this.dateWindow_) {
-    this.minxval = this.dateWindow_[0];
-    this.maxxval = this.dateWindow_[1];
-  } else {
-    for (var name in this.datasets) {
-      if (!this.datasets.hasOwnProperty(name)) continue;
-      var series = this.datasets[name];
-      if (series.length > 1) {
-        var x1 = series[0][0];
-        if (!this.minxval || x1 < this.minxval) this.minxval = x1;
-
-        var x2 = series[series.length - 1][0];
-        if (!this.maxxval || x2 > this.maxxval) this.maxxval = x2;
-      }
-    }
-  }
-  this.xrange = this.maxxval - this.minxval;
-  this.xscale = (this.xrange != 0 ? 1/this.xrange : 1.0);
+  var xlimits = this.dygraph_.xAxisRange();
+  this.minxval = xlimits[0];
+  this.maxxval = xlimits[1];
+  var xrange = xlimits[1] - xlimits[0];
+  this.xscale = (xrange !== 0 ? 1 / xrange : 1.0);
 
   for (var i = 0; i < this.yAxes_.length; i++) {
     var axis = this.yAxes_[i];
     axis.minyval = axis.computedValueRange[0];
     axis.maxyval = axis.computedValueRange[1];
     axis.yrange = axis.maxyval - axis.minyval;
-    axis.yscale = (axis.yrange != 0 ? 1.0 / axis.yrange : 1.0);
+    axis.yscale = (axis.yrange !== 0 ? 1.0 / axis.yrange : 1.0);
 
     if (axis.g.attr_("logscale")) {
       axis.ylogrange = Dygraph.log10(axis.maxyval) - Dygraph.log10(axis.minyval);
-      axis.ylogscale = (axis.ylogrange != 0 ? 1.0 / axis.ylogrange : 1.0);
+      axis.ylogscale = (axis.ylogrange !== 0 ? 1.0 / axis.ylogrange : 1.0);
       if (!isFinite(axis.ylogrange) || isNaN(axis.ylogrange)) {
         axis.g.error('axis ' + i + ' of graph at ' + axis.g +
             ' can\'t be displayed in log scale for range [' +
@@ -189,8 +207,8 @@ DygraphLayout.prototype._evaluateLimits = function() {
   }
 };
 
-DygraphLayout._calcYNormal = function(axis, value) {
-  if (axis.logscale) {
+DygraphLayout._calcYNormal = function(axis, value, logscale) {
+  if (logscale) {
     return 1.0 - ((Dygraph.log10(value) - Dygraph.log10(axis.minyval)) * axis.ylogscale);
   } else {
     return 1.0 - ((value - axis.minyval) * axis.yscale);
@@ -198,65 +216,76 @@ DygraphLayout._calcYNormal = function(axis, value) {
 };
 
 DygraphLayout.prototype._evaluateLineCharts = function() {
-  // add all the rects
-  this.points = new Array();
-  // An array to keep track of how many points will be drawn for each set.
-  // This will allow for the canvas renderer to not have to check every point
-  // for every data set since the points are added in order of the sets in
-  // datasets.
-  this.setPointsLengths = new Array();
-
-  for (var setName in this.datasets) {
-    if (!this.datasets.hasOwnProperty(setName)) continue;
-
-    var dataset = this.datasets[setName];
-    var axis = this.dygraph_.axisPropertiesForSeries(setName);
+  var isStacked = this.dygraph_.attr_("stackedGraph");
 
-    var setPointsLength = 0;
+  for (var setIdx = 0; setIdx < this.points.length; setIdx++) {
+    var points = this.points[setIdx];
+    var setName = this.setNames[setIdx];
+    var connectSeparated = this.dygraph_.attr_('connectSeparatedPoints', setName);
+    var axis = this.dygraph_.axisPropertiesForSeries(setName);
+    // TODO (konigsberg): use optionsForAxis instead.
+    var logscale = this.dygraph_.attributes_.getForSeries("logscale", setName);
 
-    for (var j = 0; j < dataset.length; j++) {
-      var item = dataset[j];
-      var xValue = parseFloat(dataset[j][0]);
-      var yValue = parseFloat(dataset[j][1]);
+    for (var j = 0; j < points.length; j++) {
+      var point = points[j];
 
       // Range from 0-1 where 0 represents left and 1 represents right.
-      var xNormal = (xValue - this.minxval) * this.xscale;
+      point.x = (point.xval - this.minxval) * this.xscale;
       // Range from 0-1 where 0 represents top and 1 represents bottom
-      var yNormal = DygraphLayout._calcYNormal(axis, yValue);
-
-      var point = {
-        // TODO(danvk): here
-        x: xNormal,
-        y: yNormal,
-        xval: xValue,
-        yval: yValue,
-        name: setName
-      };
-      this.points.push(point);
-      setPointsLength += 1;
+      var yval = point.yval;
+      if (isStacked) {
+        point.y_stacked = DygraphLayout._calcYNormal(
+            axis, point.yval_stacked, logscale);
+        if (yval !== null && !isNaN(yval)) {
+          yval = point.yval_stacked;
+        }
+      }
+      if (yval === null) {
+        yval = NaN;
+        if (!connectSeparated) {
+          point.yval = NaN;
+        }
+      }
+      point.y = DygraphLayout._calcYNormal(axis, yval, logscale);
     }
-    this.setPointsLengths.push(setPointsLength);
+
+    this.dygraph_.dataHandler_.onLineEvaluated(points, axis, logscale);
   }
 };
 
+/**
+ * Optimized replacement for parseFloat, which was way too slow when almost
+ * all values were type number, with few edge cases, none of which were strings.
+ */
+DygraphLayout.parseFloat_ = function(val) {
+  // parseFloat(null) is NaN
+  if (val === null) {
+    return NaN;
+  }
+
+  // Assume it's a number or NaN. If it's something else, I'll be shocked.
+  return val;
+};
+
 DygraphLayout.prototype._evaluateLineTicks = function() {
-  this.xticks = new Array();
-  for (var i = 0; i < this.xTicks_.length; i++) {
-    var tick = this.xTicks_[i];
-    var label = tick.label;
-    var pos = this.xscale * (tick.v - this.minxval);
+  var i, tick, label, pos;
+  this.xticks = [];
+  for (i = 0; i < this.xTicks_.length; i++) {
+    tick = this.xTicks_[i];
+    label = tick.label;
+    pos = this.xscale * (tick.v - this.minxval);
     if ((pos >= 0.0) && (pos <= 1.0)) {
       this.xticks.push([pos, label]);
     }
   }
 
-  this.yticks = new Array();
-  for (var i = 0; i < this.yAxes_.length; i++ ) {
+  this.yticks = [];
+  for (i = 0; i < this.yAxes_.length; i++ ) {
     var axis = this.yAxes_[i];
     for (var j = 0; j < axis.ticks.length; j++) {
-      var tick = axis.ticks[j];
-      var label = tick.label;
-      var pos = this.dygraph_.toPercentYCoord(tick.v, i);
+      tick = axis.ticks[j];
+      label = tick.label;
+      pos = this.dygraph_.toPercentYCoord(tick.v, i);
       if ((pos >= 0.0) && (pos <= 1.0)) {
         this.yticks.push([i, pos, label]);
       }
@@ -264,46 +293,12 @@ DygraphLayout.prototype._evaluateLineTicks = function() {
   }
 };
 
-
-/**
- * Behaves the same way as PlotKit.Layout, but also copies the errors
- * @private
- */
-DygraphLayout.prototype.evaluateWithError = function() {
-  this.evaluate();
-  if (!(this.attr_('errorBars') || this.attr_('customBars'))) return;
-
-  // Copy over the error terms
-  var i = 0; // index in this.points
-  for (var setName in this.datasets) {
-    if (!this.datasets.hasOwnProperty(setName)) continue;
-    var j = 0;
-    var dataset = this.datasets[setName];
-    var axis = this.dygraph_.axisPropertiesForSeries(setName);
-    for (var j = 0; j < dataset.length; j++, i++) {
-      var item = dataset[j];
-      var xv = parseFloat(item[0]);
-      var yv = parseFloat(item[1]);
-
-      if (xv == this.points[i].xval &&
-          yv == this.points[i].yval) {
-        var errorMinus = parseFloat(item[2]);
-        var errorPlus = parseFloat(item[3]);
-
-        var yv_minus = yv - errorMinus;
-        var yv_plus = yv + errorPlus;
-        this.points[i].y_top = DygraphLayout._calcYNormal(axis, yv_minus);
-        this.points[i].y_bottom = DygraphLayout._calcYNormal(axis, yv_plus);
-      }
-    }
-  }
-};
-
 DygraphLayout.prototype._evaluateAnnotations = function() {
   // Add the annotations to the point to which they belong.
   // Make a map from (setName, xval) to annotation for quick lookups.
+  var i;
   var annotations = {};
-  for (var i = 0; i < this.annotations.length; i++) {
+  for (i = 0; i < this.annotations.length; i++) {
     var a = this.annotations[i];
     annotations[a.xval + "," + a.series] = a;
   }
@@ -316,12 +311,15 @@ DygraphLayout.prototype._evaluateAnnotations = function() {
   }
 
   // TODO(antrob): loop through annotations not points.
-  for (var i = 0; i < this.points.length; i++) {
-    var p = this.points[i];
-    var k = p.xval + "," + p.name;
-    if (k in annotations) {
-      p.annotation = annotations[k];
-      this.annotated_points.push(p);
+  for (var setIdx = 0; setIdx < this.points.length; setIdx++) {
+    var points = this.points[setIdx];
+    for (i = 0; i < points.length; i++) {
+      var p = points[i];
+      var k = p.xval + "," + p.name;
+      if (k in annotations) {
+        p.annotation = annotations[k];
+        this.annotated_points.push(p);
+      }
     }
   }
 };
@@ -330,35 +328,12 @@ DygraphLayout.prototype._evaluateAnnotations = function() {
  * Convenience function to remove all the data sets from a graph
  */
 DygraphLayout.prototype.removeAllDatasets = function() {
-  delete this.datasets;
-  this.datasets = new Array();
+  delete this.points;
+  delete this.setNames;
+  delete this.setPointsLengths;
+  delete this.setPointsOffsets;
+  this.points = [];
+  this.setNames = [];
+  this.setPointsLengths = [];
+  this.setPointsOffsets = [];
 };
-
-/**
- * Return a copy of the point at the indicated index, with its yval unstacked.
- * @param int index of point in layout_.points
- */
-DygraphLayout.prototype.unstackPointAtIndex = function(idx) {
-  var point = this.points[idx];
-
-  // Clone the point since we modify it
-  var unstackedPoint = {};
-  for (var i in point) {
-    unstackedPoint[i] = point[i];
-  }
-
-  if (!this.attr_("stackedGraph")) {
-    return unstackedPoint;
-  }
-
-  // The unstacked yval is equal to the current yval minus the yval of the
-  // next point at the same xval.
-  for (var i = idx+1; i < this.points.length; i++) {
-    if (this.points[i].xval == point.xval) {
-      unstackedPoint.yval -= this.points[i].yval;
-      break;
-    }
-  }
-
-  return unstackedPoint;
-}